Improvement in wrist-pins foe reapers and mowers



JOHN H..ELWARD. vOF CHICAGO, ILLINOIS.l

Letters Patent No. 77,181, elated April 28, 1868; antedated .April 15,1868.

IMPROVEMENT IN WRIST-PINS FOR REAPBRS AND MOWERS.

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T0 ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN H. ELWARD, of Chicago, in the county of Cook,and State of Illinois, have invented new and useful Improved Wrist-Pinsfor Harvesters; and I dohcreby declare andmake known that the following'is a full, clear, and exact description of the same, reference being hadto the accompanying drawings, and the letters audvgures marked thereon,which form part of this specification.

My invention consists in so connecting the wrist or crank-pin to whichthe pitman-rod connected with ,the sickle is attached, that its distancefrom the centre of the crank-wheel, may'be 'varied o1: adjustedtpleasure, thereby producing longer or shorter and slower or more rapidstrokes of the sickle, as may be desired.

To enable those skilled in the art to understand how to construct anduse my invention, I will proceed to describe the same withpai'ticularity, making reference in so doing to the aforesaid drawings,in which- Figure 1 represents a side elevation of my invention, y

Figure 2 is an end view of the same, and v v Y Figure 3 is a sectionthrough a part of the crank-wheel, showing the conguration of the holein which tho wrist-pin is inserted.

The same letters of reference in the several figures indicate like partsof my invention.

A represents the shaft of the crank-wheel B, which may be revolved by abelt or cord passing around said wheel in the groove 7L, or by means ofa drum or gear-wheel, as shown at E.

In or near the periphery of thel said wheel B there is made an octagonalor other angular hole, marked b, into which one end of the crank-pin orwrist-pin C, made o' corresponding angular coniiguration, ts, as shownat c, and is secured therein, in any desired position` by means of akey, @which enters anappropriate recess at one side, as shown.

D represents the Pitman-rod, havingl a collar, d, at one end, fittingupon the other end of the wrist-pin, as shown, the other end of saidpitman being attached to the sickle in the usual manner.

When it is desired to give a long and relatively fast stroke, thewrist-pin is adjusted in the positionshown by the full lines in tig. 2.To decrease the relative velocity of the stroke and diminish its length,it may be adjusted as shown by the dotted lines H in said tig. 2; and togive the minimum relativo velocity and minimum length of stroke, it isadjusted as shown by the dotted lines L in tig. 2.

Thus it is seen that the end of the wrist-pin to which the pitman-rod isattached is readily adjusted at any required distance from the centroofthe wheel.

Having fully described the nature, construction, and operation of myinvention, I will now specify what I claim, and desire to secure byLetters Patent. A

I claim the combination of the wheel B, providedl with an angularrecessed or slotted opening, b, with the wrist-pin C, provided withangles corresponding with the said opening, and a key, a, all arrangedand operating substantially as set forth. v

JOHN H. ELWARD.

Witnesses:

W. E. Manns, L. L. Commit.v

